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Architecture of Gold Mineralization at Anomaly A of the Clarence Stream Deposits, Southern New Brunswick

J.-F. Ravenelle^1,*,, G.G. Lutes² and A.J. Hynes¹

¹ Department of Earth and Planetary Sciences, McGill University, 3450 University Street, Montréal, Québec, H3A 2A7.
² Geological Consultant, 87 Venus Crescent, Hanwell, New Brunswick, E3C 1N1.

Correspondence: Corresponding Author: jean-francois.ravenelle{at}ete.inrs.ca

The Anomaly A area of the Clarence Stream gold deposits in southwestern New Brunswick contains mineralized structures that bear geometrical relationships to regional folding events. The four mineralized zones of Anomaly A (AD, MW, 93, and Murphy) are hosted by turbiditic graywacke, quartzose wacke, siltstone, and argillite sequences of the Kendall Mountain Formation. A regional scale structural analysis reflects at least four deformational events, three of which appear to control the folded geometry of Anomaly A (D₂, D₃, and D₄). F₂ and F₃ folds are coaxial and are refolded into a dome and basin geometry by F₄ folds. The mineralized zones are subparallel to axial surfaces of F₂ folds. Structural analysis of a mineralized zone exposed at surface indicates that gold mineralization is hosted by a quartz-vein system that comprises veins generated during both D₂ and D₃. Three dimensional representations of Anomaly A created using drill-core data and ®GoCAD suggest that the quartz-vein system was emplaced in fault structures during D₂ as well as within brecciated dilation zones during D₃. Three of the four zones that make up Anomaly A have F₂ hinge surfaces that can be linked through a geometry compatible with the style of F₃ and F₄ folds. The apparent continuity of these three zones indicates the potential for kilometer-scale mineralized structures at Anomaly A.

Key Words: Gold deposit • Clarence Stream • New Brunswick • structural geology